From: Mathieu Larouche <mathieu.larouche@xxxxxxxxxx>
- Added PLL algorithm for a new rev of G200e
- Removed the bandwidth limitation for the new G200e
Signed-off-by: Mathieu Larouche <mathieu.larouche@xxxxxxxxxx>
---
drivers/gpu/drm/mgag200/mgag200_mode.c | 119 +++++++++++++++++++++++++--------
1 file changed, 90 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 9abc06f..870ea35 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -104,6 +104,8 @@ static bool mga_crtc_mode_fixup(struct drm_crtc *crtc,
return true;
}
+#define P_ARRAY_SIZE 9
+
static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
{
unsigned int vcomax, vcomin, pllreffreq;
@@ -111,38 +113,98 @@ static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
unsigned int testp, testm, testn;
unsigned int p, m, n;
unsigned int computed;
+ unsigned int pvalues_e4[P_ARRAY_SIZE] = {16, 14, 12, 10, 8, 6, 4, 2, 1};
+ unsigned int fvv;
+ unsigned int i;
+
+ if (mdev->unique_rev_id <= 0x03) {
+
+ m = n = p = 0;
+ vcomax = 320000;
+ vcomin = 160000;
+ pllreffreq = 25000;
+
+ delta = 0xffffffff;
+ permitteddelta = clock * 5 / 1000;
+
+ for (testp = 8; testp > 0; testp /= 2) {
+ if (clock * testp > vcomax)
+ continue;
+ if (clock * testp < vcomin)
+ continue;
+
+ for (testn = 17; testn < 256; testn++) {
+ for (testm = 1; testm < 32; testm++) {
+ computed = (pllreffreq * testn) /
+ (testm * testp);
+ if (computed > clock)
+ tmpdelta = computed - clock;
+ else
+ tmpdelta = clock - computed;
+ if (tmpdelta < delta) {
+ delta = tmpdelta;
+ m = testm - 1;
+ n = testn - 1;
+ p = testp - 1;
+ }
+ }
+ }
+ }
+ } else {
+
- m = n = p = 0;
- vcomax = 320000;
- vcomin = 160000;
- pllreffreq = 25000;
+ m = n = p = 0;
+ vcomax = 1600000;
+ vcomin = 800000;
+ pllreffreq = 25000;
+
+ if (clock < 25000)
+ clock = 25000;
+
+ clock = clock * 2;
+
+ delta = 0xFFFFFFFF;
+ /* Permited delta is 0.5% as VESA Specification */
+ permitteddelta = clock * 5 / 1000;
+
+ for (i = 0 ; i < P_ARRAY_SIZE ; i++) {
+ testp = pvalues_e4[i];
+
+ if ((clock * testp) > vcomax)
+ continue;
+ if ((clock * testp) < vcomin)
+ continue;
+
+ for (testn = 50; testn <= 256; testn++) {
+ for (testm = 1; testm <= 32; testm++) {
+ computed = (pllreffreq * testn) /
+ (testm * testp);
+ if (computed > clock)
+ tmpdelta = computed - clock;
+ else
+ tmpdelta = clock - computed;
+
+ if (tmpdelta < delta) {
+ delta = tmpdelta;
+ m = testm - 1;
+ n = testn - 1;
+ p = testp - 1;
+ }
+ }
+ }
+ }
- delta = 0xffffffff;
- permitteddelta = clock * 5 / 1000;
+ fvv = pllreffreq * testn / testm;
+ fvv = (fvv - 800000) / 50000;
- for (testp = 8; testp > 0; testp /= 2) {
- if (clock * testp > vcomax)
- continue;
- if (clock * testp < vcomin)
- continue;
+ if (fvv > 15)
+ fvv = 15;
- for (testn = 17; testn < 256; testn++) {
- for (testm = 1; testm < 32; testm++) {
- computed = (pllreffreq * testn) /
- (testm * testp);
- if (computed > clock)
- tmpdelta = computed - clock;
- else
- tmpdelta = clock - computed;
- if (tmpdelta < delta) {
- delta = tmpdelta;
- m = testm - 1;
- n = testn - 1;
- p = testp - 1;
- }
- }
- }
- }
+ p |= (fvv << 4);
+ m |= 0x80;
+
+ clock = clock / 2;
+ }
if (delta > permitteddelta) {
printk(KERN_WARNING "PLL delta too large\n");
@@ -1541,7 +1602,7 @@ static int mga_vga_mode_valid(struct drm_connector *connector,
if (mga_vga_calculate_mode_bandwidth(mode, bpp)
> (24400 * 1024))
return MODE_BANDWIDTH;
- } else if (mdev->unique_rev_id >= 0x02) {
+ } else if (mdev->unique_rev_id == 0x02) {
if (mode->hdisplay > 1920)
return MODE_VIRTUAL_X;
if (mode->vdisplay > 1200)
--
1.8.3.1
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